Here is part of a post I made outlining my reasoning for the choice of these heavy-duty hinges :

working on it wrote:... I'm a shadetree mechanic looking to make my own innovations, just to see what'll work and not, function not form. In defense of my solid one-piece doors: If you spread the loads caused by the act of closing/sealing the doors, and waterproof them, then future problems should be nil. Though my cut-out doors are of non-standard shape, I endeavored to spread the loads/forces involved for a tight, even seal all around. I spent some time figuring the most well-distributed loading points before I added the hinges. I did the same figuring the optimal placement for the dual-locks.

triple hinges, dual door locks.jpg (140.73 KiB) Viewed 2446 times

I used three heavy duty gate hinges with nylon bushings, and bolted them on. There will be no sag, considering the light weight of the doors. The slide-locks were chosen for security and to further spread the load. Sealed high and low, the doors are held firmly against the routed interior framework and automotive door-seal. I keep them tightly shut at all times; can't warp if they're held flat!....

Overkill, yes. But I doubt they'll ever get "loose" or wear out. I even used three more to hang my vertical hatch.

I used chrome plated "topedo" style hinges. The crappy little dry wall screws in the picture were only used for initial fitment of the doors. They are now replaced with stainless steel square drive hardware...so no rust. The hinges allow the doors to be lifted off the TD similar to the way the old Jeep CJ doors worked. I'd definitely do it this way again. I used two hinges per door, although I've also seen it done this way with 3 hinges per door.

This hinge with the 1" ID "C" channel is available Locally at any place that Makes Storm Doors for about $35 for an 8' section. Notice I said "Makes Storm Doors", your not going to find it at Home Depot.

It works out very well, you make the door, install the hinge in the jam, insert the door into the "C" channel on the hinge, adjust it then pin it.

"Conditions are never just right. People who delay action until all factors are favorable do nothing". William FeatherDon't accept "It's Good Enough" build to the best of your abilities.Teardroppers Of Oregon & Washington